I don’t remember if my overhead chat worked when I tried to warn them or not. It’s entirely possible they didn’t see the warning. Given the direction and location they may have been heading to cryo after failing to convince the doctor (you) to help them.
At least by the point they shot at me, I was an established threat to the station and the security officer was SSD in maints (which is why the officer isn’t one of the people I mention having defended myself against)
I’m not sure exactly when the guns were acquired, but I don’t mind that they had them.